Working out %abv - Home Brew Forums

 Home Brew Forums > Working out %abv

10-11-2012, 12:15 PM   #1
berk2027
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Sep 2012
Shaftesbury, Dorset
Posts: 43
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Have asked before but now done the maths and I'm confused. So I have a wine started with a sg of 1,084 so I minuse the final gravity ( 1,001 )from that witch equals 83 so I multiply that by 131.25 that equals 10,893&bull;75. So would that mean the ABV would be 10&bull;89%abv cheers

10-11-2012, 12:26 PM   #2
DRonco
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Aug 2012
Seattle, WA
Posts: 246
Liked 15 Times on 12 Posts

Your hydrometer has three sides. 1. Gravity, 2. Abv, 3. Balling. As you read the gravity, spin it to see the corresponding abv. In your case 1.084 looks like about 12% abv in your OG. Then at 1.001 looks like about 1 or 2%. Your then subtract these two figures to calculate your final ABV. In your case, should be about 10%.

Granted, I'm fairly new to the hobby, but this is how I've come to understand it. If there is anyone here with better explanations, please add.

10-11-2012, 12:31 PM   #3
GilSwillBasementBrews

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Jul 2012
Eagleville, Pennsylvania
Posts: 2,740
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Quote:
 Originally Posted by berk2027 Have asked before but now done the maths and I'm confused. So I have a wine started with a sg of 1,084 so I minuse the final gravity ( 1,001 )from that witch equals 83 so I multiply that by 131.25 that equals 10,893•75. So would that mean the ABV would be 10•89%abv cheers
Yes that's what I got 10.89%ABV so yes your math is correct. (OG - FG ) x 131.25 = ABV%
(OG 1.084 - FG 1.001) x 131.25= abv%
.083 x 131.25 = 10.89%ABV
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10-11-2012, 12:32 PM   #4
neosapien

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Mar 2012
Dallas, TX
Posts: 712
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you have it right berk

10-11-2012, 12:40 PM   #5
DRonco
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Aug 2012
Seattle, WA
Posts: 246
Liked 15 Times on 12 Posts

I hadn't seen that formula before. I like it. Nice and easy.